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If you have a SIM-unlocked AT&T or T-Mobie HTC One (M7) outside USA, there’s a good chance that you won’t get the OTA updates for your device. You need to update your device in the “dirty” way. I was having serious troubles updating my AT&T HTC One from Android 4.3 (Sense 5.0) to Android 4.4.2 (Sense 5.5). Roaming around XDA Developers forum, I came to compile a solution. Here’s the step-by-step guide: